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高速公路路基中的低速软弱夹层若处理不当,将会给高速公路的后期正常运行留下安全隐患,甚至将会导致路基结构严重的下陷和变形。本文成功地将OCCAM算法引入到瑞雷波频散曲线反演中,并获得了某路基低速软弱夹层地质结构的二维横波速度剖面。在反演过程中,权重矩阵的应用,提高了解的纵向分辨率;拉格朗日乘子光滑参数的应用改善了迭代效果并提高了解的稳定性,使其可以在解的精度和模型分辨率中取最佳折中解。实例分析结果表明,OCCAM算法用于反演低速软弱夹层瞬态瑞雷波频散曲线不但具有稳定性好、精度高及分辨能力强的优点,而且能自动分层和反演地层参数。
The improper handling of low-speed and weak interbed in expressway subgrade will cause potential safety hazard to the normal operation of expressway in the later period and may even lead to serious subsidence and deformation of subgrade structure. In this paper, the OCCAM algorithm is successfully introduced into the Rayleigh wave dispersion curve inversion, and a two-dimensional shear-wave velocity profile of the geological structure of a subgrade with low velocity weak interlayer is obtained. In the process of inversion, the weight matrix is applied to improve the longitudinal resolution of the solution. The application of the Lagrange multiplier smoothing parameters improves the iterative effect and improves the stability of the solution, making it possible to solve the problem with accuracy and model resolution Take the best compromise solution. The case study shows that the OCCAM algorithm can be used to invert the transient Rayleigh wave dispersion curves of low-velocity weak sandwiches not only with good stability, high precision and strong resolving ability, but also stratification and inversion of formation parameters automatically.